Question

Express 45 mm in cm, m and km.

Answer 1

45 mm = $\frac{45}{10}$ cm = 4.5 cm

= 4.5 cm = $\frac{4.5}{100}\mathrm{m}$ = 0.045 m

= 0.045 m = $\frac{0.045}{1000}\mathrm{km}$ = 0.000045 km

∴ 45 mm = 4.5 cm = 0.045 m = 0.000045 km